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Būkān, nestled in the western province of Āz̄arbāyjān-e Gharbī, Iran, occupies a geographically complex position at approximately 36.5150° N, 46.2075° E. The city sits within a valley carved by the Qūrzī-Būkan River, surrounded by the Zagros Mountains, a significant factor shaping its microclimate and air quality. Its elevation, averaging around 1,600 meters (5,249 feet) above sea level, contributes to cooler temperatures and, crucially, the potential for temperature inversions, a key driver of pollution accumulation. The surrounding landscape is a mosaic of agricultural lands – primarily wheat and barley cultivation – and semi-arid rangelands, interspersed with scattered villages. This agricultural activity, particularly during harvest seasons, introduces particulate matter into the air. Būkān’s location along major transportation routes connecting Iran to Iraq and Turkey means it experiences considerable vehicular traffic, a consistent source of pollutants. The urban–rural gradient is relatively sharp; the city transitions quickly into agricultural fields and then into the rugged mountainous terrain. The proximity to the Iraq-Iran border also introduces complexities related to cross-border pollution events. The valley setting, while providing some shelter, also traps pollutants, limiting dispersion. The prevailing winds, often channeled through the mountain passes, can either alleviate or exacerbate air quality issues depending on their direction and strength. The limited presence of large-scale industrial zones within the immediate vicinity mitigates some industrial pollution, but smaller workshops and brick kilns contribute to localized air quality concerns.

Būkān’s air quality follows a distinct seasonal pattern dictated by its climate and topography. Winters, lasting from November to March, are typically the most challenging. Cold air masses settle in the valley, frequently creating strong temperature inversions where a layer of warm air traps cooler air and pollutants near the ground. This inversion effect, coupled with reduced sunlight hours and limited wind speeds, leads to a build-up of particulate matter and other pollutants. Fog is also common during these months, further hindering dispersion. Spring (April-May) brings a gradual improvement as temperatures rise and winds increase, though agricultural burning practices during this period can temporarily degrade air quality. Summer (June-August) generally sees the best air quality due to stronger winds, higher temperatures promoting atmospheric mixing, and reduced agricultural burning. However, dust storms originating from the deserts of Iraq and Syria can occasionally impact Būkān, significantly increasing particulate matter levels. Autumn (September-October) marks a transition period; as temperatures cool, the risk of inversions returns, and agricultural activities resume, leading to a gradual decline in air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activities during periods of stagnant air and reduced visibility. During dust storm events, wearing masks and staying indoors is recommended. The combination of valley geography and seasonal meteorological shifts makes proactive air quality monitoring and public health advisories crucial for Būkān’s residents.